ACV Low pressure switch 55439129

The ACV Low pressure switch 55439129 is an original spare part used to monitor water pressure in heating systems. It safely shuts down the boiler if pressure levels become abnormal, protecting the system from overheating and pressure drops. This switch is compatible with ACV Compact Condens 27, Prestige 24 Solo MK1, and Delta Pro S 25 boilers. It has a 1/2 connection thread and is identified by SKU 55439129 or 129.214.001.

Parts of this type are selected by matching the connection thread size and pressure range to the boiler's specifications. Before ordering, verify the thread type (e.g., 1/2) and ensure the switch's setpoint aligns with the system's required operating pressure. Installation typically involves connecting the switch to the water circuit and wiring it to the boiler's control board.

When a pressure switch of this kind fails, the boiler may shut down unexpectedly or fail to start, often due to incorrect pressure readings. Symptoms include error codes related to low or high water pressure, or the boiler not responding to pressure changes. Check the switch for continuity and proper operation by testing with a multimeter and comparing readings to the expected pressure thresholds.